Jewel carrying tool and method of making the same



June 4 I M. QRQNEL a I v JEWEL CARRYING TOOL AND METHOD CEMAKING' THE SAME 1 Filed 0. 5, 1945 Maur p'i's COIOILBL.

Patented June 10, 1947 HEWELGARRYING TOOL SAND METHQD OF THE SAME Maurits (loronel, Bangor, Wales Application October 3, 1945., Serial No. 620,107 In GreatBritain October 18, 1944 This invention relates to jewel carrying tools and method of making the same.

Up to the present time it is the usual practice to fit a diamond or other appropriate jewel into a slot in .a steel shank, to wed e the jewel in the .slot by wedges forced into the .slot on opposite sides of the diamond and then brazed in position.

These operations are extremely difiicult and tedious to carry out.

It is the object of the present invention to provide an improved method by means of which diamonds or the like can be secured in steel shanks in a simple and efiicient manner.

According to the present invention a method of fitting a diamond or the like in a steel shank consists in forming a parallel-sided transverse slot in the end of the steel shank, compressing the slot to substantially the shape of the diamond or the like which it is to receive, fitting the diamond or the like into a transverse slot of a wedgeshaped bar, forcing the bar, with the diamond or the like therein, from one end into the slot, and then brazing the bar in the slot.

The compression of the slot in the shank is preferably effected with the use of a bar of hard steel which in cross section has a base portion of rectangular cross section from which the sides slope or taper upwardly and towards one another to a distance substantially equal to the size of the diamond or the like.

The bar with the transverse slot is substantially of the same cross sectional shape as the hard steel bar.

The invention will now be described by way of example with reference to the accompanying drawing, wherein:

Figure l is a partial perspective View of a tool shank;

Figure 2 is a view similar to Figure 1 of the tool shank after being shaped to receive a diamond; and

Figure 3 is a partial perspective view of a tool shank fitted with a diamond.

Referring to the drawing, a straight slot l is formed diametrically in the end of a circular steel shank 2 in any suitable manner, for example by milling.

Into the slot I thus formed is fitted a bar 3 of hard steel of wedge-shaped cross section. The lower portions 4 of the sides of the bar 3 are parallel to one another, and are spaced apart a distance substantially equal to the width of the slot I. The upper portions 5 of the sides of the bar 3 slope or taper upwardly and towards one another at an angle so as to conform substantially 5 Claims. (01. -38) 2 with the shape of a diamond 5' to be secured in position. The upper side .5 of the bar 3 which lies substantially flush with the end 1 of the shank is of such a width that when the diamond 6 is placed in position .as hereinafter described .a suflicient amount of the diamond 6 projects from the end of the shank 2 for operative purposes, as shown in Fig. 3.

The end of the shank l is now compressed so as to force the sides of the slot I against the bar 3 so that the slot I conforms with the shape of the bar 3, as shown in Figure 2.

The bar 3 is now withdrawn and the slot I is ready to receive the diamond 6'.

For the purpose of fitting the diamond 8' into position, a steel cross bar 8 of the same length as the slot I and of the same cross section as the bar 3 of hard steel, is provided with a transverse recess 9 in the upper side thereof, at the middle of its length and corresponding with the size of the diamond 6'.

After the diamond 6' has been fitted into the recess 9 the cross bar 8 is forced laterally into the slot l in the shank 2 and the cross bar 8 is brazed in position.

As the notch 9 is transverse to the cross bar 8, the diamond 6' is secured immovably in position.

The method according to the invention has various' advantages, amongst which may be mentioned the following:

Whilst with the usual method an operator can set six to ten tools per day, twenty to twenty-five tools can be set in the same period of time by the present method.

Cross bars 8 can be prepared in advance.

As the cross bars 8 are cut to length the tool can be finished off neatly in a minimum of time.

Chipping of diamonds during the setting is reduced to a minimum.

As the cross bar 8 is in a single piece it is stronger than separate wedges.

The invention is applicable to the mounting of diamonds of all shapes.

Whilst the invention has been described more specifically in connection with the setting of a diamond, it will be understood that the invention is also applicable to the setting of other stones used in industry.

What I claim is:

l. A method of fitting a jewel in a steel shank, consisting in forming a parallel-sided transverse slot in the end of said shank, fitting a wedgeshaped steel bar into said slot, compressing the sides of the slot against the sides of said bar,

removing said bar endwise from said slot, fitting a jewel into a transverse slot in a second wedgeshaped bar, forcing said second bar from one end into said compressed slot, and brazing the second bar in said slot.

2. A method according to claim 1, wherein said bars have a base portion of rectangular cross section from which the sides of the bars taper upwardly andtowards one another so as to conform substantially with the shape of the jewel.

3. A method according to claim 1, wherein said bars have a base portion of rectangular cross section from which the sides of the bars taper upwardly and towards one another so as to conform substantially with the shape of the jewel, said second bar being of the same length as the slot.

4. A method of fitting a chisel-shaped diamond into a steel shank, consisting in milling aparallei-sided slot in the flat end of a circular steel shank, fitting into said slot a wedge-shaped steel bar, compressing the sides of said slot against said bar, removing said bar endwise from said slot, inserting into said slot from one end thereof a second wedge-shaped steel bar, said second 'bar in said slot, said wedge-shaped bar being of the same length as said slot, said bar having a transverse slot in its upper face, said transverse slot being located midway of the length of said bar, and a chisel-shaped diamond engaging said transverse slot and projecting from said diametral slot, said bar being secured in said dia- 25 Number 'metral slot by brazing.v

MAURITS CORONEL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date 262,655 Emerson Aug. 15, 1882 

